Hydrogen-Mediated Reductive Cross-Coupling of Aryl Iodides with Activated Aryl and Heteroaryl Bromides
Weijia Shen, Yu-Hsiang Chang, B. Gonzalez, Aidan P. Looby, Jordan J. Dotson, Nicholas A. White, Brad P. Carrow, Michael J. Krische
Abstract
Hydrogen-mediated reductive cross-couplings of aryl iodides with activated aryl and heteroaryl bromides are described, along with related homocouplings (Ullmann reactions) and vinylic reductive couplings that occur with cine -substitution. To corroborate key events in the catalytic cycle, Pd-to-Pd transmetalation and cross-selective reductive elimination, dianionic diarylpalladate complexes [Pd(Aryl)(μ-Br)Br] 2 [NPr 4 ] 2 bearing p -fluorophenyl, p -methoxyphenyl and p -nitrophenyl moieties were prepared. Stoichiometric reactions of these complexes in the presence of iodide demonstrate that Pd-to-Pd transmetalation by way of monomeric arylpalladates occurs at a greater rate than reductive elimination and that cross-selective C–C reductive elimination is favored for electronically distinct aryl partners. Hydrogen-mediated reductive cross-coupling of aryl iodides with α-bromostyrene occurs with cine -substitution (as observed in related formate-mediated processes), consistent with carbopalladation of α-bromostyrene by monomeric arylpalladates Pd(Aryl)I 2 [NBu 4 ] that arise upon dissociation of [Pd(Aryl)(μ-I)I] 2 [NBu 4 ] 2 .